Tony Vargas
Legend
This is a misleading statement in multiple ways, making assumptions that you simply cannot prove out. There are a billion 'alternatives' out there.
For the vast majority of the player base, which is larger by many degrees than the player base has likely ever been, 5e is the end all, be all.

One major alternative we tend not to consider is just not getting into TTRPGs, at all.
That's an option whether you're jacked into anything D&D or not.
How many people don't play D&D?